code: def test_set(self):
      buffer = BufferWithInfiniteLookback(
          data=[0, 1, 2, 3, 4, 5, 6, 7],
          lookback=2,
      )
      # Directly via the []-notation.
      buffer[0:2] = [200, 300]
      check(buffer.data, [0, 1, 200, 300, 4, 5, 6, 7])
      buffer[-1] = 700
      check(buffer.data, [0, 1, 200, 300, 4, 5, 6, 700])
      buffer[-3] = 500
      check(buffer.data, [0, 1, 200, 300, 4, 500, 6, 700])
      buffer[-4:-2] = [400, 5000]
      check(buffer.data, [0, 1, 200, 300, 400, 5000, 6, 700])
      buffer[0] = 2000
      check(buffer.data, [0, 1, 2000, 300, 400, 5000, 6, 700])
      buffer[-4:-1] = [400, 5000, 60]
      check(buffer.data, [0, 1, 2000, 300, 400, 5000, 60, 700])
  
      # Reset to initial values (excluding lookback buffer).
      buffer[:] = [2, 3, 4, 5, 6, 7]
      check(buffer.data, [0, 1, 2, 3, 4, 5, 6, 7])
  
      # Via the `set` method.
      buffer.set([200, 300], at_indices=slice(0, 2))
      check(buffer.data, [0, 1, 200, 300, 4, 5, 6, 7])
      buffer.set(700, at_indices=-1)
      check(buffer.data, [0, 1, 200, 300, 4, 5, 6, 700])
      buffer.set(500, at_indices=-3)
      check(buffer.data, [0, 1, 200, 300, 4, 500, 6, 700])
      buffer.set([400, 5000], at_indices=slice(-4, -2))
      check(buffer.data, [0, 1, 200, 300, 400, 5000, 6, 700])
      buffer.set(2000, at_indices=0)
      check(buffer.data, [0, 1, 2000, 300, 400, 5000, 6, 700])
      buffer.set([400, 5000, 60], at_indices=slice(-4, -1))
      check(buffer.data, [0, 1, 2000, 300, 400, 5000, 60, 700])
      # Check "out of index" conditions.
      self.assertRaises(
          IndexError, lambda: buffer.set(100, at_indices=-100)
      )
      self.assertRaises(
          IndexError,
          lambda: buffer.set(
              100, at_indices=-3, neg_indices_left_of_zero=True
          ),
      )
      self.assertRaises(
          IndexError,
          lambda: buffer.set(
              100, at_indices=-9, neg_indices_left_of_zero=False
          ),
      )
      self.assertRaises(
          IndexError, lambda: buffer.set(100, at_indices=6)
      )
      self.assertRaises(
          IndexError, lambda: buffer.set(100, at_indices=100)
      )
  
      # Reset to initial values (excluding lookback buffer).
      buffer.set([2, 3, 4, 5, 6, 7])
      check(buffer.data, [0, 1, 2, 3, 4, 5, 6, 7])
  
      # Via the `set` method with going into the lookback buffer.
      buffer.set(
          [100, 200, 300],
          at_indices=slice(-1, 2),
          neg_indices_left_of_zero=True,
      )
      check(buffer.data, [0, 100, 200, 300, 4, 5, 6, 7])
      buffer.set(-999, at_indices=-2, neg_indices_left_of_zero=True)
      check(buffer.data, [-999, 100, 200, 300, 4, 5, 6, 7])
      buffer.set(
          [-998, 1000],
          at_indices=slice(-2, 0),
          neg_indices_left_of_zero=True,
      )
      check(buffer.data, [-998, 1000, 200, 300, 4, 5, 6, 7])
      buffer.set(2000, at_indices=0, neg_indices_left_of_zero=True)
      check(buffer.data, [-998, 1000, 2000, 300, 4, 5, 6, 7])
      # Negative steps.
      buffer.set(
          [-1, -4],
          at_indices=slice(3, 1, -1),
          neg_indices_left_of_zero=True,
      )
      check(buffer.data, [-998, 1000, 2000, 300, -4, -1, 6, 7])
      buffer.set([-10, -40, -30], at_indices=slice(3, 0, -1))
      check(buffer.data, [-998, 1000, 2000, -30, -40, -10, 6, 7])
      # Check proper error handling if provided new_data is larger/smaller than slice.
      self.assertRaises(
          IndexError,
          lambda: buffer.set([100, 101], at_indices=slice(0, 1)),
      )
  
file_path: ray/rllib/env/tests/test_lookback_buffer.py
imports: import unittest
  import gymnasium
  import numpy
  from ray.rllib.env.utils import BufferWithInfiniteLookback
  from ray.rllib.utils.spaces.space_utils import batch, get_dummy_batch_for_space
  from ray.rllib.utils.test_utils import check
label_desc: Use image node_id 9 for calling the TestBufferWithInfiniteLookback obj's underlying member method code with example usage: obj.test_set() without return types